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  New results from the tungsten programme at ASDEX Upgrade

Neu, R., Dux, R., Geier, A., Krieger, K., Maier, H., Pugno, R., et al. (2003). New results from the tungsten programme at ASDEX Upgrade. Journal of Nuclear Materials, 313-316, 116-126. doi:10.1016/S0022-3115(02)01386-7.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-235F-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0175-D
Genre: Journal Article

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 Creators:
Neu, R.1, Author              
Dux, R.1, Author              
Geier, A.2, Author              
Krieger, K.3, Author              
Maier, H3, Author              
Pugno, R.4, Author              
Rohde, V.2, Author              
Yoon, S. W.4, Author              
ASDEX Upgrade Team5, Author
Affiliations:
1Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              
2Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
3Material Research (MF), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856328              
4External Organizations, ou_persistent22              
5Max Planck Institute for Plasma Physics, Max Planck Society, Boltzmannstraße 2, D-85748 Garching, DE, ou_1856284              

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Free keywords: 15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 15), Gifu, 2002-05-26 to 2002-05-31
 Abstract: Since 1998 an increasing area of tungsten coated tiles has been installed at the central column of ASDEX Upgrade, reaching 7.1 m² in 2001/2002. The tiles were coated commercially by plasma arc deposition to a thickness of 1 μm. Post mortem analysis of the W-coating showed a strong erosion, which is attributed to ion sputtering, due to its two-dimensional variation. During the campaigns with W-coated central column, almost no negative influence on the plasma performance was found. Only during direct plasma wall contact or for reduced clearance in divertor discharges spectroscopic evidence for tungsten influx could be found. Effective sputtering yields of about 10⁻³ were derived, pointing to a strong contribution by light intrinsic impurities to the total W-sputtering. The increased W-content during plasma current ramp up decreases after X-point formation and the flux consumption during current ramp is only marginally enhanced compared to the graphite wall case. The W concentrations ranged from below 10⁻⁶ up to a few times 10⁻⁵. In discharges with increased density peaking, a tendency for impurity accumulation was observed, which affected only a closely localized central region. Central heating led to a strong reduction of the central impurity content, consistent with neoclassical impurity transport.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Journal of Nuclear Materials
  Alternative Title : J. Nucl. Mater.
Source Genre: Journal
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Publ. Info: Copyright © 2003 Elsevier Science B.V. All rights reserved
Pages: - Volume / Issue: 313-316 Sequence Number: - Start / End Page: 116 - 126 Identifier: -